Tuesday, May 5, 2009

Problem 29 - GMAT Geometry

How many diagonals does a polygon of nine sides have?

(A) 72
(B) 54
(C) 36
(D) 27
(E) 24
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2 comments:

  1. blaoismOctober 6, 2009 at 1:21 AM

    9c2 - 9 sides = 27 (D)

    ReplyDelete
  2. AnonymousNovember 9, 2009 at 8:53 AM

    there is a formula for this. n(n-3) divided by 2
    so that gives (9 * 6)/2 = 27

    ReplyDelete

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